Electric discharge device



Nov. 19, 1935- H. scHuMAcHER ET AL ELECTRIC DISCHARGE DEVICE Filed May12, 1932 Patented Nov. 19, 1935 UNITED' sTATEs ELECTRIC DISCHARGE DEVICEHans Schumacher, Berlin-Lichterfelde-West, and Heinrich Zodtner,Birkenwerder, near Berlin, Germany, assignors to C. LorenzAktiengesellschaft, Berlin-Tempelhof, Germany Application May 12, 1932,Serial No. 610,848 In Germany May 15, 1931 3 Claims.

This invention relates to water cooling arrangements for electrondscharge tube apparatus wherein two or more electron discharge tubes arearranged to work in parallel or in push-pull connection, and moreparticularly to such ari rangements in which the cooling water flows inparallel circuits to the water jackets of the discharge tubes over aWater resistance common to the water circuits of all the jackets.

In arrangements of this type, if one of the anodes or one of thesurrounding water jackets becomes accidentally grounded, parallelshortcircuit currents flow to this point from the water jackets of allthe tubes over the inlet and outlet water pipes extending to thejackets. Such short-Circuit currents may easily attain a dangerousmagnitude. The object of this nvention is to render such short-circuitsless harmful.

In accordance with the nvention in a water cooling system for coolingthe anodes of electron discharge tubes, in which the Cooling water flowsin parallel circuits to the water jackets of a plurality of dischargetubes over a water resistance common to the water circuits of all thewater jackets, additional water resistances are provided between the'respective inlet and outlet p-ipes extending to the water jackets of thedifferent discharge tubes so that the jackets are not directly connectedtogether electrically. With this arrangement, if an anode or waterjacket becomes accidentally grounded, the total short-Circuit4 currentis substantially reduced, due to the inclusion of the additional waterresistances in the short-circuts.

In a preferred arrangement, in which the' inlet and outlet pipesextending to the water jackets are branched off from an insulatingmember formed with waterchannels and interposed between them and thewater supply and outlet conduits, a part of the water channelsconstitutes the common water resistance and a part provides theadditional water resistances.

These and other features of the invention specified in the appendedclaims will be better understood from the following description,reference being had to the accompanying drawing in which:

Fig. 1 is a sectioned elevation illustrating one embodiment of theinvention, the representation of the electric circuits being in partdiagrammatical. Fig. 2 is an elevation of a detail which is part of asecond embodiment. Fig. 3 is a plan view to Fig. 2.

In Fig. 1, two electron tubes 3, 4 are shown.

The anodes A3, A4 thereof are cylindrical and are each contained in areceptacle Z3, Z4. The receptacle Z3 is by a tube 2 connected with ahelical channel b provided in a member l that consists of insulatingmaterial such as porcelain or the like. A tube 2' connects thereceptacle Z3 5 1 with a second helical channel d of the member l. Thereceptacle Z4 is by a tube connected With the channel b and by a tubeconnected with the channel d. The tubes 2, 2' are joined to thesechannels at other points than are the 10 tubes B, 6', so that the tubes2, 6 are separated from each other by a'portion b' of the channel b andthe tubes 2', 6' likewise separated from one another, namely by aportion d' of the channel d. The channels b, ct are connected with water15 supply conduits e and respectively. A direct current source A,earthed at Y, is through a resistance Wii and a choke coil D3 connectedto the receptacle Z3 and through a resistance W4 and a choke coil Dilconnected to the receptacle Z4. This 20 connection is such that thereceptacles Z3, Z!! are connected in parallel to the current source A.These receptacles and the tubes 2, 2', 6, 6' are electrically conductve.The anodes A3, A4 are in electric connection with that receptacle 25 Zor Z4 in which they are disposed. The electron tubes 3, 4 are joined toeach other in pushpull connection, as will ba seen from the oscllatorycircuit S. A coil C, coupled to this circuit,

is part of a second arrangement that may be of 30 exactly the samedescription as the one represented, and is not shown therefore.

The arrows in Fig. 1 indicate the direction in which the cooling watermay be caused to flow. The water entering through conduit e fiows 35through channel Z'J and tubes 2, 6 into the receptacles Z3, Zil andthence through tubes 2', 6' and channel dV into conduit The water thusmoves along the anodes A3, A4 so as to cool them.

If a grounding arises at X, for instance, then 40 the following twocircuits are established thereby, viz: A, W3, D3, Z3, X, Y, A and A, W4,D4,'Z4, tubes 6, 6' in parallel, passages b', d' in parallel, tubes 2,2' in parallel, Z3, X, Y, A. The receptacle Z3 is thus subjected to bothof thev currents flow- 45 ing in these circuits. Owing to the water,however, contained in the channels b', d', the current in the secondsaid Circuit is decreased so that the receptacles Z3, Zil are bothsubjected. to a considerable smaller short ci'cuit current than if there50 were no such water resistance, for instance, if the receptacles Z3, Zwere conductively connected with each other.

The modfication shown in Figs. 2 and 3 is adapted for connecting sixelectron tubes to the 55 member l in a like manner as that representedin Fig. 1 for two electron tubes. As shown in Fig. 2, the member Icarries a top 9 in Which twelve channels g are provided. This top islikewise made of insulating material, such as porcelain. To thesechannels conduits h are attached in the same Way as the tubes 6, 6', 2,2', represented in Fig. 1, are attached directly to the member I. Thetop 9 is thus a means for adapting the member l to the provision of morethan two electron tubes. The channels gr can be made to be of equallengths so as to present equal water resistances.

The .arrangements here described may be altered or perfected Within thescope indicated by the appended claims, Without departing from the'spirit or sacrificing any of the advantages of this invention.

What is claimed is:

l. A water Cooling system for cooling the anodes of electron dischargetubes comprising a plurality of electron tube Water jackets, a set ofmetallic inlet pipes and a set of metallic outlet pipes connected to therespective Water jackets for conducting the cooling Water thereto andtherefrom, and an insulating member having formed therein a Waterchannel vvith a pilurality of multiple branches respectively connectedto the pipes of one of said sets, said Water channel constituting aWater resistance common to said Water jackets .and co-operating Withsaid branches to provide Water channels separating said connected pipesand constituting Water resistances therebetween.

2. A Water Cooling system for cooling the anodes of electron dischargetubes having in'combination Water jackets for the anodes of said tubes,and parallel hydraulic circuits for the flow of the cooling water to thewater jackets of a plurality of electron discharge tubes comprisingthereof providing a Water resistance between the respective inlet andoutlet pipes, Whereby the Water jackets of the discharge tubes areprevented from being conductively connected together over a path of lowelectrical resistance.

3. A water cooling system for cooling the anodes of electron dischargetubes comprising a plurality of electron tube Water jackets, a set ofmetallic inlet pipes and a set of metallic outlet pipes connected to therespective Water jackets for conducting the cooling fluid thereto andtherefrom, and an insulating member having formed therein Water channelseach having a plurality of multiple branches, the multiple branches ofone Water channel being connected to the respective pipes of one of saidsets and the multiple branches of another of the Water channels beingconnected to the respective pipes of the other of said sets, each ofsaid Water channels constituting a Water resistance common to said Waterjackets and cooperating With the respective branches to provide Waterchannels separating said connected pipes and constituting waterresistances therebetween.

HANS SCHUMACHER. HEINR. ZODTNER.

